Top-pair production at the LHC with MINNLOPS

Mazzitelli, Javier; Monni, Pier Francesco; Nason, Paolo; Ré, Emanuele; Wiesemann, Marius; Zanderighi, Giulia

doi:10.1007/jhep04(2022)079

Cited by 31 publications

(28 citation statements)

References 137 publications

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“…(2.31)), as discussed for instance in ref. [73], as well as for the scales used in the non-singular contribution (last term in the same equation).…”

Section: Comparison With Atlas Resultsmentioning

confidence: 99%

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NNLO+PS Monte Carlo simulation of photon pair production with MiNNLOPS

Gavardi,

Oleari,

2022

Preprint

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We present a NNLO QCD accurate event generator for direct photon pair production at hadron colliders, based on the MiNNLO PS formalism, within the Powheg Box Res framework. Despite the presence of the photons requires the use of isolation criteria, our generator is built such that no technical cuts are needed at any stage of the event generation. Therefore, our predictions can be used to simulate kinematic distributions with arbitrary fiducial cuts. Furthermore, we describe a few modifications of the MiNNLO PS formalism in order to allow for a setting of the renormalization and factorization scales more similar to that of a fixed-order computation, thus reducing the numerical impact of higher-order terms beyond the nominal accuracy. Finally, we show several phenomenological distributions of physical interest obtained by showering the generated events with Pythia8, and we compare them with the 13 TeV data from the ATLAS Collaboration.

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“…(2.31)), as discussed for instance in ref. [73], as well as for the scales used in the non-singular contribution (last term in the same equation).…”

Section: Comparison With Atlas Resultsmentioning

confidence: 99%

“…Recently, results for top-pair production at NNLO+PS were also published in ref. [72,73]. As far as diphoton production is concerned, the only NNLO+PS accurate results have been obtained with the Geneva method in ref.…”

mentioning

confidence: 99%

NNLO+PS Monte Carlo simulation of photon pair production with MiNNLOPS

Gavardi,

Oleari,

2022

Preprint

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“…The hard scale in the logarithm is consistently changed to m V H /2 as explained in ref. [144]. At small transverse momenta, we use the standard MiNNLO PS scale setting given in eq.…”

Section: Jhep07(2022)008mentioning

confidence: 99%

Next-to-next-to-leading order event generation for VH production with H → $$ b\overline{b} $$ decay

Zanoli

Chiesa

Ré

et al. 2022

J. High Energ. Phys.

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We consider the Higgsstrahlung process in hadronic collisions and present the computation of next-to-next-to-leading order predictions matched to parton showers for both production and H → $$ b\overline{b} $$ b b ¯ decay employing the MiNNLOPS method. We present predictions for ZH and W±H production including spin correlations and off-shell effects by calculating the full processes pp → ℓ+ℓ−H → ℓ+ℓ−$$ b\overline{b} $$ b b ¯ , pp → $$ {\nu}_{\ell }{\overline{\nu}}_{\ell }H $$ ν ℓ ν ¯ ℓ H → $$ {\nu}_{\ell }{\overline{\nu}}_{\ell }b\overline{b} $$ ν ℓ ν ¯ ℓ b b ¯ and pp → ℓ±νℓH → $$ {\ell}^{\pm }{\overline{\nu}}_{\ell }b\overline{b} $$ ℓ ± ν ¯ ℓ b b ¯ in the narrow-width approximation for the Higgs boson. For the W±H process, NNLO+PS accuracy in production and decay is achieved for the first time. Our calculations are validated against earlier simulations in the NNLOPS approach that includes NNLO corrections via multi-differential reweighting. The new MiNNLOPS generators for these processes, which evaluate NNLO corrections on-the-fly in the event generation, will supersede those earlier calculations. Our predictions are in good agreement with recent measurements of the Higgsstrahlung cross sections.

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“…First, the signature pp → + − E T features a large multi-boson and top quark background, and will be difficult to observe. However, considering the extent to which SM simulations at NNLO+LL(PS) can describe data [111][112][113][114], the presumable mass difference between SM and Zee-Babu particles [28,35], and prospective search strategies [52,56,115], we premise this is attainable. Second, it is possible to show that the signature's E T is driven by two neutrinos since (a) the cross-section ratio of pp → + − E T with respect to different lepton flavors is fixed by oscillation data (see section 5.4), and (b) the kinematic distributions of , , and E T are constrained since h ∓ → ∓ ν is a two-body decay involving (approximately) two massless states.…”

Section: Establishing Non-conservation Of Lepton Number At the Lhcmentioning

confidence: 99%

Doubly charged Higgs boson production at hadron colliders II: a Zee-Babu case study

Ruiz

2022

J. High Energ. Phys.

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Motivated by searches for so-called leptonic scalars at the LHC and the recent measurement of the W boson’s mass at the Tevatron, we revisit the phenomenology of the Zee-Babu model for neutrino masses and the ability to differentiate it from the Type II Seesaw model at the LHC. We conclude that this task is much more difficult than previously believed. All inputs equal in the two scenarios, we find that total and differential rates for producing pairs of doubly and singly charged scalars are identical in shape and only differ in normalization. The normalization is given by the ratio of hadronic cross sections and can be unity. Differences in cross sections are small and can be hidden by unknown branching rates. This holds for Drell-Yan, γγ fusion, and gg fusion, as well as observables at LO and NLO in QCD. This likeness allows us to reinterpret Run II limits on the Type II Seesaw and estimate projections for the HL-LHC. Using updated neutrino oscillation data, we also find that some collider observables, e.g., lepton flavor-violating branching ratios, are now sufficiently precise to provide a path forward. Other means of discrimination are also discussed. As a byproduct of this work, we report the availability of new Universal FeynRules Object libraries, the SM_ZeeBabu UFO, that enable fully differential simulations up to NLO+LL(PS) with tool chains employing MadGraph5_aMC@NLO.

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Top-pair production at the LHC with MINNLOPS

Cited by 31 publications

References 137 publications

NNLO+PS Monte Carlo simulation of photon pair production with MiNNLOPS

NNLO+PS Monte Carlo simulation of photon pair production with MiNNLOPS

Next-to-next-to-leading order event generation for VH production with H → $$ b\overline{b} $$ decay

Doubly charged Higgs boson production at hadron colliders II: a Zee-Babu case study

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